Andy_Langton - 3:16 pm on Sep 22, 2012 (gmt 0)

If the link categorically goes to your domain name (and not a slight variation), then the symptoms point at hacking or malware.

The specific type of hacking that would explain this is where the hacker inserts javascript into your pages, which then redirect at random. Try the safe browsing diagnostic to see if theere are any clues, otherwise you need to have a look at the actual code of your site (not view the pages) to check for anything suspicious: [google.com...]

If it's malware, then that would normally be installed on your own PC, usually at the browser level. This is easy to verify by testing with an alternate machine you can be certain isn't compromised. It doesn't sound like it will be the case here as a third party informed you of it.

Incidentally, here's a decent discussion on hacked site redirecting: [webmasterworld.com...]